ab = {
'Swaroop': 'swaroop@swaroopch.com', 
'Larry': 'larry@wall.org', 
'Matsumoto': 'matz@ruby-lang.org', 
'Spammer': 'spammer@hotmail.com' 
}
print("Swaroop's address is", ab['Swaroop']) 
del ab['Spammer'] 
print('\nThere are {} contacts in the address-book\n'.format(len(ab))) 
for name,addr in ab.items(): 
    print(name)
    print(addr)
    # print('Contact {} at {}'.format(name, address)) 

ab['Guido'] = 'guido@python.org' 
if 'Guido' in ab: 
    print("\nGuido's address is", ab['Guido']) 
